TITLE:   GCN CIRCULAR
NUMBER:  13950
SUBJECT: GRB 121028A: Swift/UVOT Upper Limits
DATE:    12/11/05 16:58:22 GMT
FROM:    Mike Siegel at PSU/Swift MOC  <siegel@swift.psu.edu>

M. H. Siegel (PSU) and R. L. C. Starling (U Leicester) report on
behalf of the Swift/UVOT team.

The Swift/UVOT began settled observations of the field of
GRB 121028A 133s after the BAT trigger (Starling et al.,
GCN Circ. 13913).  Data summed from the first and second orbits
do not reveal a source at the enhanced position of the X-ray
afterglow (Evans et al., GCN Circ. 13918).

The 3-sigma upper limits for the finding chart (fc) and
summed exposures are reported below:

FILTER     T_start(s)  T_stop    Exposure     Mag/3UL
========================================================
white (fc)   133        283        147        >19.96
white        877       7754        540        >21.07
v           6528       6727        196        >18.94
b           2713       2758         44        >19.10
u            345        595        245        >19.43
u           7143       7343        196        >19.68
uvw1        6938       7138        196        >19.61
uvw2        7761       7961        196        >19.90
=======================================================

The above magnitudes are not corrected for the Galactic extinction
corresponding to a reddening of E_{B-V} = 1.41 (Schlegel et al., 
1998, ApJS, 500, 525). The photometry is on the UVOT photometric
system described in Breeveld et al. 2011 (AIP Conf. Proc. 1358, 373)